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<div class="title">samples/cpp/create_mask.cpp</div>  </div>
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<p>This program demonstrates using mouse events and how to make and use a mask image (black and white) .</p>
<div class="fragment"><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment">* create_mask.cpp</span></div><div class="line"><span class="comment">*</span></div><div class="line"><span class="comment">* Author:</span></div><div class="line"><span class="comment">* Siddharth Kherada &lt;siddharthkherada27[at]gmail[dot]com&gt;</span></div><div class="line"><span class="comment">*</span></div><div class="line"><span class="comment">* This tutorial demonstrates how to make mask image (black and white).</span></div><div class="line"><span class="comment">* The program takes as input a source image and outputs its corresponding</span></div><div class="line"><span class="comment">* mask image.</span></div><div class="line"><span class="comment">*/</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d6/d87/imgcodecs_8hpp.html">opencv2/imgcodecs.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d8/dcc/namespacestd.html">std</a>;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"></div><div class="line"><a name="_a0"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> src, img1, <a name="a1"></a><a class="code" href="../../da/dd3/group__gapi__math.html#gaba076d51941328cb7ca9348b7b535220">mask</a>, <span class="keyword">final</span>;</div><div class="line"></div><div class="line"><a name="_a2"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> point;</div><div class="line">vector&lt;Point&gt; pts;</div><div class="line"><span class="keywordtype">int</span> drag = 0;</div><div class="line"><span class="keywordtype">int</span> var = 0;</div><div class="line"><span class="keywordtype">int</span> flag = 0;</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> mouseHandler(<span class="keywordtype">int</span>, <span class="keywordtype">int</span>, <span class="keywordtype">int</span>, <span class="keywordtype">int</span>, <span class="keywordtype">void</span>*);</div><div class="line"></div><div class="line"><span class="keywordtype">void</span> mouseHandler(<span class="keywordtype">int</span> event, <span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y, <span class="keywordtype">int</span>, <span class="keywordtype">void</span>*)</div><div class="line">{</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span> (event == <a name="a3"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#gga927593befdddc7e7013602bca9b079b0ad3419100fc2d7688c6dbe3da030fbfd9">EVENT_LBUTTONDOWN</a> &amp;&amp; !drag)</div><div class="line">    {</div><div class="line">        <span class="keywordflow">if</span> (flag == 0)</div><div class="line">        {</div><div class="line">            <span class="keywordflow">if</span> (var == 0)</div><div class="line">                img1 = src.<a name="a4"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#adff2ea98da45eae0833e73582dd4a660">clone</a>();</div><div class="line">            point = <a name="a5"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(x, y);</div><div class="line">            <a name="a6"></a><a class="code" href="../../d9/db7/group__datasets__gr.html#gga610754124ced68d1f05760b5948fbb76a6f0d8b2d9e3e947b2a5c1eff9e81ee95">circle</a>(img1, point, 2, <a name="a7"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0, 0, 255), -1, 8, 0);</div><div class="line">            pts.push_back(point);</div><div class="line">            var++;</div><div class="line">            drag  = 1;</div><div class="line"></div><div class="line">            <span class="keywordflow">if</span> (var &gt; 1)</div><div class="line">                <a name="a8"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2">line</a>(img1,pts[var-2], point, <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0, 0, 255), 2, 8, 0);</div><div class="line"></div><div class="line">            <a name="a9"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Source&quot;</span>, img1);</div><div class="line">        }</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span> (event == <a name="a10"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#gga927593befdddc7e7013602bca9b079b0a59cad7ffe959adf2782a110196d47bf6">EVENT_LBUTTONUP</a> &amp;&amp; drag)</div><div class="line">    {</div><div class="line">        <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Source&quot;</span>, img1);</div><div class="line">        drag = 0;</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span> (event == <a name="a11"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#gga927593befdddc7e7013602bca9b079b0aa3536f83b6f48da5121041f58fc7a683">EVENT_RBUTTONDOWN</a>)</div><div class="line">    {</div><div class="line">        flag = 1;</div><div class="line">        img1 = src.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#adff2ea98da45eae0833e73582dd4a660">clone</a>();</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span> (var != 0)</div><div class="line">        {</div><div class="line">            <a name="a12"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga1ea127ffbbb7e0bfc4fd6fd2eb64263c">polylines</a>( img1, pts, 1, <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0,0,0), 2, 8, 0);</div><div class="line">        }</div><div class="line"></div><div class="line">        <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Source&quot;</span>, img1);</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span> (event == <a name="a13"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#gga927593befdddc7e7013602bca9b079b0aacdda7d94278928c34b61a7bd8be9f62">EVENT_RBUTTONUP</a>)</div><div class="line">    {</div><div class="line">        flag = var;</div><div class="line">        <span class="keyword">final</span> = Mat::zeros(src.<a name="a14"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a146f8e8dda07d1365a575ab83d9828d1">size</a>(), <a name="a15"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a>);</div><div class="line">        mask = Mat::zeros(src.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#a146f8e8dda07d1365a575ab83d9828d1">size</a>(), <a name="a16"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga81df635441b21f532fdace401e04f588">CV_8UC1</a>);</div><div class="line"></div><div class="line">        <a name="a17"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga8c69b68fab5f25e2223b6496aa60dad5">fillPoly</a>(mask, pts, <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(255, 255, 255), 8, 0);</div><div class="line">        <a name="a18"></a><a class="code" href="../../d2/de8/group__core__array.html#ga60b4d04b251ba5eb1392c34425497e14">bitwise_and</a>(src, src, <span class="keyword">final</span>, mask);</div><div class="line">        <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Mask&quot;</span>, mask);</div><div class="line">        <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Result&quot;</span>, <span class="keyword">final</span>);</div><div class="line">        <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Source&quot;</span>, img1);</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span> (event == <a name="a19"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#gga927593befdddc7e7013602bca9b079b0a1dd67e6d96873c36dd3a9670e8312a28">EVENT_MBUTTONDOWN</a>)</div><div class="line">    {</div><div class="line">        pts.clear();</div><div class="line">        var = 0;</div><div class="line">        drag = 0;</div><div class="line">        flag = 0;</div><div class="line">        <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Source&quot;</span>, src);</div><div class="line">    }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div><div class="line">{</div><div class="line">    <a name="_a20"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html">CommandLineParser</a> parser(argc, argv, <span class="stringliteral">&quot;{@input | lena.jpg | input image}&quot;</span>);</div><div class="line">    parser.about(<span class="stringliteral">&quot;This program demonstrates using mouse events\n&quot;</span>);</div><div class="line">    parser.printMessage();</div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;\n\tleft mouse button - set a point to create mask shape\n&quot;</span></div><div class="line">        <span class="stringliteral">&quot;\tright mouse button - create mask from points\n&quot;</span></div><div class="line">        <span class="stringliteral">&quot;\tmiddle mouse button - reset\n&quot;</span>;</div><div class="line">    <a class="code" href="../../dc/d84/group__core__basic.html#ga1f6634802eeadfd7245bc75cf3e216c2">String</a> input_image = parser.get&lt;<a class="code" href="../../dc/d84/group__core__basic.html#ga1f6634802eeadfd7245bc75cf3e216c2">String</a>&gt;(<span class="stringliteral">&quot;@input&quot;</span>);</div><div class="line"></div><div class="line">    src = <a name="a21"></a><a class="code" href="../../d4/da8/group__imgcodecs.html#ga288b8b3da0892bd651fce07b3bbd3a56">imread</a>(<a name="a22"></a><a class="code" href="../../d6/dba/group__core__utils__samples.html#ga3a33b00033b46c698ff6340d95569c13">samples::findFile</a>(input_image));</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span> (src.empty())</div><div class="line">    {</div><div class="line">        printf(<span class="stringliteral">&quot;Error opening image: %s\n&quot;</span>, input_image.c_str());</div><div class="line">        <span class="keywordflow">return</span> 0;</div><div class="line">    }</div><div class="line"></div><div class="line">    <a name="a23"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>(<span class="stringliteral">&quot;Source&quot;</span>, <a name="a24"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#ggabf7d2c5625bc59ac130287f925557ac3acf621ace7a54954cbac01df27e47228f">WINDOW_AUTOSIZE</a>);</div><div class="line">    <a name="a25"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga89e7806b0a616f6f1d502bd8c183ad3e">setMouseCallback</a>(<span class="stringliteral">&quot;Source&quot;</span>, mouseHandler, NULL);</div><div class="line">    <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Source&quot;</span>, src);</div><div class="line">    <a name="a26"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>(0);</div><div class="line"></div><div class="line">    <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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